While Kalanick says he is leaving because of the tragic loss of his mother, who died during a boating accident, it is also presumably because he has been at the helm while several ordeals - like allegations of sexism - have peppered the ride-sharing company.

We've heard it many times: The company needs to grow up. Separately, Holder's firm Covington & Burling said Uber's board should review Kalanick's responsibilities and reassign some of them to others.

Ames said the recommendations were strong but indicated Uber had few policies, and the ones it had were not followed. The report also called for the appointment of a senior executive to oversee the implementation of its recommendations.

Uber released all of Holder's recommendations, but not the full report in order to protect the privacy of those filing complaints. The report also recommends adding more independent directors and replacing its chairman, Uber co-founder Garrett Camp, with an independent chairman. The board now has eight voting members, three from within the company.

The report also recommends that Uber make sure its workforce becomes more diverse from the top down.

The law firm is also urging Uber to adopt its version of the "Rooney Rule" for hiring women and underrepresented minorities. In the USA, less than a third of the company's workers are female.

Last week, the company fired 20 people including some managers at the recommendation of Perkins Coie, which probed specific complaints made to the company about sexual harassment, bullying, and retaliation for reporting problems. As of late previous year, Uber's private-market valuation had climbed to almost $70 billion.

Uber's public perception has taken a beating in recent months due to a number of controversies.

A company can be aggressive yet have strong values, said Joseph Holt, a business ethics professor at the University of Notre Dame.

"Having a good reputation for ethics is a competitive advantage", Holt said.

4. Uber's frat culture was real.

.

"There's a lot of data that shows when there's one woman on the board, it's much more likely that there will be a second woman on the board", she said around six minutes into the recording.

He said he did not want his comments to create distraction "as Uber works to build a culture of which we can be proud", Bonderman added.

The 3:59 gives you bite-size news and analysis about the top stories of the day, brought to you by the CNET News team in NY and producer Bryan VanGelder.

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